To provide a vertical kiln capable of preventing the drop of a firebrick by rigidly supporting a circulating cylinder body arranged in a furnace body.

An upper space serving as a preheating area is formed between a furnace cover 14 where a combustion gas supply device 15 is disposed and a horizontal annular disk shaped furnace bed 11 having a dropping opening 11A for dropping raw material after preheating, a lower space serving as a firing area is formed on the lower side than the furnace bed, a circulating cylinder 20 which penetrates the dropping opening in a furnace body, is extended over the upper space and the lower space in the vertical direction to form an inner space and has a lower opening 22 downward, is arranged, and the inflow of gas in a lower part in the furnace body 10 from the lower part opening 22 is permitted, the gas rises through the inner space of the circulating cylinder 20 and is supplied to the upper space after the temperature rising. The furnace body 10 and the circulating cylinder body 20 are connected to each other by connection parts 18 at a plurality of positions in the circumferential direction on the position of the dropping opening 11A on the furnace bed 11 in the vertical direction, and the raw material after preheating can be dropped between the connection parts 18 adjacent to each other.